* config/fp-bit.c (clzusi): New function.
	(si_to_float, usi_to_float): Use it to compute proper shift.
	(usi_to_float): Preserve guard bits when shifting right.
	* libgcc-std.ver (GCC_4.2.0): New version.
	* libgcc2.c (__floatundixf, __floatunditf, __floatundidf,
	__floatundisf): New functions.
	* libgcc2.h (__floatundixf, __floatunditf, __floatundidf,
	__floatundisf): Declare.
	* mklibgcc.in (lib2funcs): Add _floatundidf, _floatundisf,
	_floatundixf, and _floatunditf.
	* optabs.c (expand_float): If target does not define a pattern for
	signed or unsigned conversion, use an unsigned libcall instead of
	a signed one.
	(init_optabs): Initialize ufloat_optab.

testsuite:
	* gcc.c-torture/execute/floatunsisf-1.c: New test.

From-SVN: r107345